US4340149A - Lined closure - Google Patents

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US4340149A
US4340149A US06/201,608 US20160880A US4340149A US 4340149 A US4340149 A US 4340149A US 20160880 A US20160880 A US 20160880A US 4340149 A US4340149 A US 4340149A
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Prior art keywords
liner
orientation
resin
press
cap
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US06/201,608
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English (en)
Inventor
Fumio Mori
Gunji Matsuda
Toshihiko Yoshida
Shigeru Nagashima
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/78—Moulding material on one side only of the preformed part
    • B29C70/80—Moulding sealing material into closure members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/04—Discs

Definitions

  • the present invention relates to a cap and its method of manufacture having a liner of superior resistance to stress cracking including cracking under environmental conditions.
  • the invention relates to a liner of a thermoplastic resin which is formed by compression on an inside surface of a cap shell, with the result that sealability, peeling resistance and the long term sealability after heat treatment of the cap are markedly improved.
  • caps having liners are disclosed in Japanese patent application Publication No. 41-5588 (1966) and comprises the step of supplying a piece of molten thermoplastic resin to the inner surface of a cap shell and the step of pressing the piece between the shell body and a cooled press to form the liner shape.
  • a further method is disclosed in Japanese patent application Publication No. 48-5706 (1973) where the thermoplastic resin is supplied as a prepared form to the inner surface of the cap shell after which the form is softened by heating the shell. The form is then pressed between the cap shell and a cooled press to form the liner shape.
  • the liner of a cap engage with a container mouth in a tightly sealed manner, and consequently the outer periphery of the liner that engages with the container mouth should be furnished with one or more ring-shaped projections or with a concave channel.
  • Prior methods of press forming a liner have the advantage of simultaneously forming the liner shape from the piece of thermoplastic resin and sealing the liner to the container cover shell.
  • the sealing performance of press formed liners has in many instances been inferior to that of prepared form disc-shaped liners punched from liner sheets. This is due in part to such factors as the compressive force applied to the liner, contact with the contained product or the vapor of the contained product and the temperatures applied during sterilization, all of which may cause microcracks to form in the liner and particularly on the peripheral portion of the liner which is the most important portion from a sealing function.
  • the tendency for formation of this sort of cracking increases as the compression forming of the liner is carried out at greater speed and as annular projections and concave channels are formed for more effective dimensioning of the liner periphery.
  • caps furnished with press formed resin liners in spite of the fact that the resin itself has an essentially superior performance, have not in all instances shown satisfactory sealability, liner anti-peelability or long-term sealability after heat treatment.
  • a further object of the present invention is to provide for a press formed resin lined cap and a method of manufacturing the same where the cap has a superior combination of sealability, liner peeling resistance and long-term sealability after heat treatment than prior art caps.
  • Still another object of the present invention is to provide for a resin lined cap and a method of manufacturing the same where stress cracking is effectively prevented in caps having ring-shaped projections and/or concave channels which are formed at the outer periphery of the liner where it contacts a container opening.
  • Yet another object of the present invention is to provide for a resin lined cap where the diameter of the cap is comparatively large and where a piece of thermoplastic resin used as a liner is applied inside the cap shell in a comparatively small amount, and where stress cracking is effectively prevented even in cases when the piece of resin is pressed and expanded to a comparatively large diameter.
  • a further object of the present invention is to provide for a resin lined cap where stress cracking is prevented even in cases where the liner shape is formed from a piece of resin at high speeds.
  • the invention comprises a cap having a thermoplastic liner which is press-formed onto an inside bottom surface of a cap shell.
  • the press forming of the liner is done under conditions such that the difference between the intrasurface orientation index of the outer peripheral portion of the liner and the intrasurface orientation index of the central portion of the liner does not exceed 0.37 where the intrasurface orientation index is defined as l+m and where l represents the orientation coefficient in the radial direction of the liner and m represents the orientation coefficient in the circular direction of the liner.
  • l as used hereinafter in the Tables in connection with the description of the invention is represented by the character l.
  • the difference between the balance degree of the liner at its outer peripheral portion and the balance degree of the liner at its central portion should not exceed 0.3 where balance degree is defined as l-m.
  • the cap liner is to have projecting rings forming a groove on its peripheral portion adapted to engage the open end of a container, that the projections have a thickness 2 to 20 times the thickness of the thin central portion of the liner.
  • the liner itself should comprise an olefin resin and preferably a low density polyethylene having at least one enhancing ingredient added thereto selected from a group comprising an ethylene-propylene copolymer and a styrene-diene-styrene block copolymer in amounts of 3-40 wt/% of the low density polyethylene. It is also advantageous that the low density polyethylene have a melt index of 1.0 to 20 g/10 minutes.
  • the cap is produced by a method including the steps of supplying the resin to the inner surface of the cap in a heated or molten state and then pressing the resin into the desired liner shape under conditions to give the desired difference in the intrasurface orientation indices as outlined above and preferably the desired difference balance degrees as also outlined above.
  • FIG. 1 is a plan view illustrating the inside of a cap constructed according to the invention
  • FIG. 2 is a partial sectional side view of the cap of FIG. 1 taken along lines I--I;
  • FIG. 3 is a plan view of a pilfer-proof cap constructed according to the invention.
  • FIG. 4 is a sectional view of the cap of FIG. 3 taken along lines II--II;
  • FIG. 5 is a sectional view of the mouth of a bottle used in tests outlined in Example 2;
  • FIG. 6 is a perspective view of an instantaneous pressure tester utilized in the tests of Example 2;
  • FIG. 7 is a plan view of a cap used in the test outlined in Example 4.
  • FIG. 8 is a partial side sectional view of the cap of FIG. 7 taken along lines III--III;
  • FIG. 9 is a sectional view illustrating the dimensions of the mouth of a bottle used in the tests of Example 4.
  • FIGS. 10A, 10B and 10C are diagrammatical sketches illustrating steps in the press forming of a liner according to the invention.
  • a cap is illustrated constructed according to the invention which is adapted to cover and seal an open end of a container and where the cap comprises a crown shell 1 having a top sheet 2 and a skirt 4 including a plurality of pleats.
  • a thermoplastic resin liner 5 is positioned on the inner bottom surface of the sheet and is formed by press forming in place inside the shell.
  • the liner has a comparatively thin central part 6 and comparatively thick ring-shaped projections 7 and 7 provided on the outer peripheral part that are adapted to engage with a bottle mouth.
  • a ring-shaped concave channel 8 is formed between the ring projections 7 and 7.
  • Liner 5 is thermally adhered to the inside bottom surface of the shell 1 by means of a thermal adhesion paint layer (not illustrated) at the same time as the liner is press-formed.
  • the intrasurface orientation characteristic value of the liner 5 that is the difference (I o P -I o C ) between the value (I o C ) of the central part of the liner and the value (I o P ) of the peripheral part of the liner be 0.37 maximum, preferably 0.27 maximum, and most preferably 0.15 maximum, in order to completely prevent stress cracking.
  • the intrasurface orientation index referred to herein is defined by the following equation:
  • l is the orientation coefficient of the liner surface in the radial direction and m is the orientation coefficient of the liner surface in the circular direction.
  • This two dimensional direction orientation coefficient is obtained from methods that utilize the optical anisotropy of fluorescent molecules to determine, qualitatively and quantitatively, the molecular orientation accompanying the solid deformation of high molecules that comprise thermoplastic resins, or the orientation form or orientation degree of molecular orientation during streaming in the molten state.
  • the orientation coefficient can be shown quantitatively by the following formula:
  • I.sub. ⁇ ( ⁇ ) shows the polarized component strength of the fluorescence generated from the thermoplastic resin being tested, .sub. ⁇ indicating the fact that the photometric polarization direction and the oscillation direction of the incident polarization are parallel.
  • ⁇ shows the angle of rotation of the sample against the oscillation direction of the polarization.
  • ⁇ shows the maximum excitation probability when the oscillation direction of the excitation fluorescence and the sample molecular axis are parallel, and ⁇ shows the molecular fluorescence contraction.
  • l is the proportion of molecules oriented in the radial direction in the final liner wall surface
  • m is the proportion of molecules oriented in a circular direction in the final liner at right angles to l
  • the piece of molten thermoplastic resin was pressed by a cooled press such that the piece was spread and formed into the prescribed shape.
  • the surface of the liner coming into contact with the press necessarily received intrasurface orientation from plastic deformation, and the degree of this intrasurface orientation was markedly larger in the peripheral parts of the liner than in the central part where the degree of deformation was smaller. This was particularly true when forming ring-shaped projections on the periphery of the liner which were adapted to engage with a bottle mouth.
  • Liners having large differences between the intrasurface orientation index value for the liner center and for the liner periphery may not have cracks initially but when given accelerated crack resistance tests, cracks will appear in a very short time and when given environmental heat resistance tests, cracks will form to a very high degree under simultaneous conditions of compressive force, contact with container contents and temperature.
  • the present invention reduces cracking as described above by controlling the intrasurface orientation of the entire surface of the liner such that the difference between the value of the intrasurface orientation index for the liner periphery (I o P ) and the value for the liner center (I o C ) is kept at 0.37 maximum. Control of the intrasurface orientation in the liner periphery results in the time period for 50% cracking being lengthened five-fold or more when compared in accelerated cracking tests with prior products and results in no crack formation in actual bottle environmental heat resistance tests.
  • l is the orientation coefficient of the liner in the radial direction
  • m is the orientation coefficient of the liner in the peripheral or circular direction
  • the difference (D B P -D B C ) between the balance degree in the liner periphery (D B P ) and the balance degree in the liner center (D B C ) should be 0.3 maximum, and preferably 0.25 maximum, from the standpoint of stress cracking resistance.
  • the present invention is useful when the liner has at least one ring-shaped projection adapted for sealing the liner periphery with a container mouth and when this projection is 2 to 20 times the thickness of the thin part of the liner center and especially when the projection is 4 to 10 times the thickness of the center part.
  • Stress cracking has a tendency to occur to a great degree in press-formed liners having projections as described above because in order to bring about the flow of resin from the center part to the projection, a very high degree of orientation in the radial direction occurs.
  • the intrasurface orientation index characteristic value (I o P -I o C ) In order that the intrasurface orientation index characteristic value (I o P -I o C ) will not exceed 0.37 maximum, that is in order to control the intrasurface orientation of the liner periphery, at least one of the following conditions should be used.
  • the temperature of the molten resin is made as high as possible.
  • the resin is maintained below its solution temperature and at least 70° C., and preferably at least 100° C., above its melting or softening point.
  • the molecular orientation of the entire liner surface is controlled by maintaining the surface temperature of the press lower than the melting point or softening point of the resin but still as high as possible during the pressing period. To accomplish this, the surface temperature of the press is maintained at between 20° C. minimum and 40° C., and at least 5° C. lower than the melting or softening point of the resin.
  • the cap shell is preheated to a temperature higher than the melting point or softening point of the resin.
  • the surface temperature of an anvil used in conjunction with the press to support the shell and to press-form the molten resin is maintained between 20° C. minimum and preferably 40° C., and at least 5° C. lower than the melting point or softening point of the resin.
  • Pressing is done at high speed to expand and stream the resin in a molten state.
  • the drop of the press is 100 milliseconds maximum, and preferably 50 milliseconds maximum.
  • the compressive force of the press is kept to a comparatively small pressure, ordinarily 50 kg/cm 2 maximum, and particularly 20 kg/cm 2 maximum since the proportion of molten resin and the proportion of resin solids are ordinarily large.
  • An orientation inhibiting ingredient is included in the resin in order to inhibit the orientability of the resin that will comprise the liner.
  • blends are made with elastomers or thermoplastic elastomers.
  • FIGS. 10A, 10B and 10C The process for producing a cap of the present invention is best illustrated in FIGS. 10A, 10B and 10C.
  • piece 10 of a molten resin is supplied through a die of an extruder and a rotary cutter (both not shown) to the inside of cap shell 1.
  • shell 1 can be preheated by means such as high frequency induction heater.
  • Piece 10 should be in a state where it is temporarily adhered in shell 1.
  • Shell 1 having the piece of molten resin is then moved to the pressing station and while shell 1 is supported by an anvil 11, press 13 and sleeve 12 positioned above the shell drop down such that the press engages the piece of resin.
  • Anvil 11 has a cooling device 14 furnished in its central part corresponding to the center of the liner and the central part of press 13 corresponding to the center of the liner has a cooling device 15.
  • a central surface part 16 is formed on the surface of the press and has a flat and/or smoothly curved surface for forming the thin part of the liner.
  • a peripheral ring-shaped concave part 17 for forming the ring projection of the liner is on the outer periphery of the press 13.
  • sleeve 12 first engages with the inner periphery of the skirt of shell 1, and after shell 1 is firmly fastened by the sleeve, press 13 falls rapidly to begin pressing the molten piece of resin.
  • the molten resin piece 10 is then expanded or spread rapidly in the radial direction and the forming of the liner shape is rapidly accomplished.
  • the intrasurface orientation of at least the liner periphery is markedly controlled. Further, the air present between press 13 and shell 1 is exhausted to the outside through the interstices between press 13 and sleeve 12.
  • the piece of molten resin is press-formed into liner 5 exactly as prescribed and at the same time, liner 5 is thermally adhered to shell 1.
  • Liner 5 is held in this pressed condition for a fixed period of time during which the entire liner body is gradually cooled by cooling mechanisms 14 and 15 emplaced in anvil 11 and press 13 so as to produce a hardened liner.
  • Sleeve 12 and press 13 are then raised to obtain a cap furnished with press-formed liner 5.
  • the metal comprising the cap shell of the present invention will ordinarly be a metal foil in the range of 1 to 100 microns thick, preferably 5 to 100 microns thick, or a metal sheet 100 microns or more in thickness.
  • types of metals used those used being for example foil or sheets of surface untreated steel (black plate), surface treated steel, or light metals such as aluminum.
  • Suitable examples of surface treated steel are steels in foil or sheet form whose surfaces have been by chemical treatments such as sulfuric acid treatment or chromic acid treatment, electrolytic treatment such as electrolytic chromic acid treatment and electric tin plating, and melt plating treatment such as melt tin plating treatment.
  • the surfaces of these metals should also be given one or two layers or more of a protective paint and a thermally adhesive undercoating paint for the liner.
  • suitable protective paints are one or combinations of two or more of phenol-epoxy paint, epoxy-urea paint, epoxy-melamine paint, phenol-epoxy-vinyl paint, epoxy-vinyl paint, vinyl chloride-vinyl acetate copolymer paint, vinyl chloride-vinyl acetate-anhydride maleic acid copolymer paint, unsaturated polyester paint and saturated polyester paint.
  • a thermally adhesive paint for the liner can be applied directly on the metal material or on the protective paint.
  • the lining resin is an olefin resin
  • a known olefin resin thermally adhesive paint for example polyethylene oxide and acid modified olefin resin are dispersed in a coat forming olefin resin.
  • the vinyl resin paint and vinyl resin modified paint can be used.
  • Coated metal materials are formed into any desired container cover shape, such as so-called crowns, pilfer-proof caps, screw caps and twist-off caps, and are used in the method of manufacturing of the present invention.
  • the thermoplastic resin used as the liner can be any desired thermoplastic resin capable of melt-forming and having cushionability as a liner.
  • Thermoplastic resins particularly useful for the objects of the present invention are olefin resins, for example polyolefin, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-ester acrylate copolymer and ionomers, used singly or in combinations of two or more, and other soft vinyl chloride resins can also be used.
  • Thermoplastic resins that are particularly useful for the objects of the present invention are low density polyethylene and ethylene copolymers, and form the standpoints of liner properties and prevention of orientation, substances should be used that are blends in low density polyethylene of at least one of: (a) ethylene-propylene copolymer, and (b) thermoplastic elastomer, particularly ethylene-diene (butadiene or isoprene)-styrene block copolymer, and these enhancing ingredients should be contained in the low density polyethylene at 3 to 40 wt%.
  • the olefin resin used in order not to impart an excessive degree of intrasurface orientation to the liner periphery, should have a comparatively large melt flowability.
  • a low density polyethylene should be used where the melt index (M.I.) is in the range of 1.0 to 20 g/10 min., particularly 3 to 10 g/min. That is polyethylene having an M.I. smaller than the above range will have a great tendency for large surface orientation at the liner periphery during press-forming and stress cracking will occur easily.
  • polyethylene having an M.I. larger than this range will have a tendency toward stress cracking under severe liner environmental conditions even where the intrasurface orientation is controlled in the outer periphery.
  • thermoplastic resin used in the present invention may have compounding ingredients that are known, for example, white or colored pigments such as titanium white or carbon black, fillers such as calcium carbonate, white carbon or clay, antioxidants, lubricants, plasticizers, anti-static agents and heat stabilizers, all in blending ratios that are themselves known.
  • white or colored pigments such as titanium white or carbon black
  • fillers such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium carbonate, white carbon or clay
  • antioxidants such as calcium
  • the amount of resin supplied to the container cover shell will vary depending on the size of the shell, but ordinarily it will be in the range of 100 mg to 10 g.
  • a paint comprising 70 parts by weight of vinyl chloride-vinyl acetate copolymer, 25 parts by weight of bisphenol A type epoxy resin, 5 parts by weight of amino resin and an organic solvent was applied by roll coating onto a surface treated steel sheet 0.3 mm thick as an anti-rust undercoating lacquer. The sheet was then heated at 190° C. for 10 minutes.
  • a primer composition comprising 70 parts by weight of epoxy resin, 10 parts by weight of urea resin, 20 parts by weight of maleic acid modified polyethylene and an organic solvent was applied by roll coating over the anti-rust undercoating as an adhesive paint and the sheet was heated at 200° C. for 10 minutes.
  • the painted sheet was then formed into crown shells with the coated surface inside. The crown shells obtained were then heated at 150° C.
  • Test (1) Intrasurface orientation index and balance degree difference.
  • Each type of crown liner was peeled, and the molecular orientation coefficients l (radial direction) and m (peripheral direction) were obtained by a polarized fluorescence method (FOM) for the center parts and the outer peripheral parts of the peeled liner (the parts contacting the ring-shaped projections on the side near the crown centers).
  • FOM polarized fluorescence method
  • Test (2) Peeling strength. The peeling strength between crown and liner was measured (peeling speed 50 mm/minute, temperature 20° C., peeling angle 90°, tension tensile tester).
  • Test (3) Instantaneous pressure. Instantaneous pressure tests were done based on JIS S-9017.
  • Test (4) Stress cracking resistance test.
  • a 0.1% RIBONOKKUSU solution (Raion Yushi [Lion Fat & Oil Co., Ltd.]) as a crack promoter was held at 50° in a constant temperature water tank. Lined crowns, except for their pleats, were bent to an angle of 90° with the lined parts in front and immersed in the 0.1% RIBONOKKUSU solution, examined with a microscope, and the time it took for cracks to form in 50% of the samples (F50) was measured.
  • Example 2 The same paints as in Example 1 were painted onto an aluminum sheet 0.25 mm thick (Furukawa Aruminiyumu Kogyo ]Furukawa Aluminum Industries], 5052) to make the coated sheet. Cap shells (28 mm diameter, 15.6 mm high) were then formed so that the coated surface was on the insides.
  • the cap shells thus obtained were heated with a high frequency heating apparatus at 140° C., and various types of polyethylene as shown in Table 3 were extruded from an extruder under conditions also shown in Table 3. Molten resin particles (0.4 g) were cut with a rotating knife and inserted onto the inside centers of the heated cap shells.
  • the liner shapes were immediately formed by pressing with the press under conditions shown in Table 3, and various types of lined caps were thus made.
  • FIG. 2, Table 3 and Table 4 give the liner forming conditions and the details of the various polyethylenes used.
  • Test 1 Intrasurface orientation index difference (I o P -I o C ) and balance degree difference (D B P -D B C ).
  • the various types of caps had their liners peeled and the intrasurface orientation index differences (I o P -I o C ) and balance degree difference (D B P -D B C ) were obtained by the same method as in Example 1 for the peeled liners.
  • evaluations were carried out using a 130 ml capacity bottle having a bottle mouth of the measurements (in mm) shown in FIG. 5 for the various types of lined caps.
  • a bottle, not shown, capped with a lined cap is positioned in the instantaneous pressure measurement apparatus so that the top of the cap is pressed against an exhaust pin 25.
  • Pin 25 pierces the liner and the cap contacts rubber packing 26.
  • the bottle is supported by bottle support rod 23 and bottle support packing 24.
  • the cover 37 is closed, covered fastener 30 is fastened, and the intake switch 34 then opened so that gas flows into the bottle via exhaust pin 25.
  • the instantaneous pressure valve is read off bottle internal pressure meter 34.
  • a bottle supporter attachment screw 21 a bottle supporter 22
  • a rubber packing 26 a pin holding stand 27
  • a water removal opening 28 a covered switch latch 29
  • a discharge air switch 31 a safety apparatus 32
  • a gas pressure meter 35 a gas pressure regulation valve 36.
  • Test 4 Stress cracking resistance test.
  • Caps with the side surface screws removed were bent to angles of 90° under the same conditions as in Example 1 with the liner parts on the surface and immersed in a crack promoter (0.1% RIBONOKKUSU solution). The caps were then inspected with a microscope, and the time (F50) until cracks occurred in 50% of the samples was measured.
  • Cap shells were made by the same method as in Example 2. Also, an aluminum sheet identical to that in Example 2 was roll coated with vinyl-phenol paint as a polyvinyl chloride liner and heating was done at 190° C. for 10 minutes. Also, instead of the modified polyethylene paint of Example 1, a maleic acid modified polypropylene was used as a polypropylene liner. Using this coated sheet, caps with polyvinyl chloride liners were prepared in the same manner as before.
  • thermoplastic resin liners in Table 7 were formed in the above cap shells under the forming conditions of Table 6 and by the same method as in Example 2. However, cap shells having the several polypropylene coatings and polyvinyl chloride coatings were used in making the polypropylene liners and polyvinyl chloride liners. Also, the blended resins Nos. 5-14 among the samples of materials shown in Table 7 were melt-blended with a commonly used kneader and previously made into uniformly dispersed pellets.
  • caps formed under Forming Condition 2 show marked molecular orientation in their outer peripheral vicinities, and because of this, even though the lined caps were made of blended elastic polymers, their properties were not sufficient for practical use. It is believed that this marked molecular orientation is a result of the glass bottle mouth being set in between the two projections (two rings) furnished along the outer periphery of the liner and that the rings received a partial elongation stress such that the molecular orientation in this part was repeated resulting in the decline in practical characteristics and cracking in the tests.
  • lined caps having the molecular orientation suppressed to a fixed limit by the forming processing conditions had very superior practical properties.
  • the ethylene-propylene copolymer and the styrene-diene-styrene block copolymer showed marked effect in stopping molecular orientation and in improving every type of property.
  • Coated sheets were prepared using the same aluminum sheet as in Example 2 and the same coatings as in Example 1. Then various sizes of cap shells having coated surfaces on the inside were formed by ordinary methods as shown in FIG. 7, FIG. 8, Table 11 and Table 12. The various types of cap shells thus obtained were heated with the same heating apparatus as in Example 2 under conditions shown in Table 9.
  • 10 parts by weight styrene-butadienestyrene 0.01 parts by weight stearic acid amide and 6 parts by weight titanium white, uniformly dispersed in the resin
  • the liner shapes formed at this time are as shown in FIGS. 7 and 8 and in Table 11. Further, Table 9 and Table 10 respectively show the details of the liner forming conditions and the molten resin supply amounts for each type of cap.
  • Example 2 The same types of tests and evaluations as in Example 2 were carried out using bottles having bottle mouths shown in FIG. 9 and in Table 12, for each of the said cap types.
  • the bottle capacities were 100 ml for 16 mm, 100 ml for 18 mm, the same as in Example 2 for 28 mm, 250 ml for 38 mm, 300 ml for 63 mm and 500 ml for 82 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Closures For Containers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Laminated Bodies (AREA)
US06/201,608 1978-07-22 1980-10-28 Lined closure Expired - Lifetime US4340149A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP53-88954 1978-07-22
JP8895478A JPS5520126A (en) 1978-07-22 1978-07-22 Container cover with liner and method of producing same

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US06059196 Continuation 1979-07-20

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US4340149A true US4340149A (en) 1982-07-20

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JP (1) JPS5520126A (enrdf_load_stackoverflow)
AR (1) AR219402A1 (enrdf_load_stackoverflow)
AU (1) AU523059B2 (enrdf_load_stackoverflow)
BE (1) BE877796A (enrdf_load_stackoverflow)
BR (1) BR7904654A (enrdf_load_stackoverflow)
CA (1) CA1134322A (enrdf_load_stackoverflow)
CH (1) CH634522A5 (enrdf_load_stackoverflow)
DE (1) DE2929752A1 (enrdf_load_stackoverflow)
ES (2) ES482693A1 (enrdf_load_stackoverflow)
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IT (1) IT1122244B (enrdf_load_stackoverflow)
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NZ (1) NZ191021A (enrdf_load_stackoverflow)
SE (1) SE440215B (enrdf_load_stackoverflow)
ZA (1) ZA793733B (enrdf_load_stackoverflow)

Cited By (13)

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US4717034A (en) * 1982-07-06 1988-01-05 Owens-Illinois Closure Inc. One-piece thermoplastic closure having press-on screw off structure including spaced vertical ribs in the skirt of the closure
US4971213A (en) * 1987-04-21 1990-11-20 Japan Crown Cork Co., Ltd. Plastic cap
US5685443A (en) * 1995-03-06 1997-11-11 White Cap, Inc. Composite closure and method of making same
US5692628A (en) * 1996-01-11 1997-12-02 Rexam Closure, Inc. Press-on screw-off self-tapping closure/container package
US20030041568A1 (en) * 2001-09-04 2003-03-06 Seidita Thomas M. Crown-like twist-off closure
US6672469B2 (en) * 2000-07-07 2004-01-06 Peter Querbach Beverage bottle and method for closing a beverage bottle
US20050167392A1 (en) * 2004-01-29 2005-08-04 Fabricas Monterrey, S.A. De C.V. Metallic cap closure having water repelling properties and method of fabricating the same
US20060194892A1 (en) * 2005-02-28 2006-08-31 Sealed Air Corporation (Us) Blended foam having improved flexibility at sub-freezing temperatures
US20090084753A1 (en) * 2007-09-28 2009-04-02 Victor Ramos Process For Tooling For Manufacture Of A Composite Part Composite Stopper Obtained By Such A Process Or Such Tooling
US20090223967A1 (en) * 2008-03-07 2009-09-10 Silgan Plastics Corporation Container with overcap
WO2016044460A1 (en) * 2014-09-16 2016-03-24 Dayton Systems Group, Inc. Cap assembly having inside seal
US11174080B2 (en) * 2018-03-28 2021-11-16 Can-Pack Metal Closures Spolka Z Ograniczona Odpowiedzialnoscia Easily openable pull-off beverage bottle closure
US20230019020A1 (en) * 2020-03-23 2023-01-19 Nippon Closures Co., Ltd. Metal cap and method for manufacturing same

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JPS5184434A (en) * 1975-01-22 1976-07-23 Toshiba Denki Kigu Kk Ekitainenryono kikasochi
JPS5915062A (ja) * 1982-07-16 1984-01-26 日本クラウンコルク株式会社 樹脂キヤツプ及びその製造法
JPS6138318A (ja) * 1984-07-31 1986-02-24 Matsushita Electric Ind Co Ltd 液体燃料燃焼装置
DE59801678D1 (de) * 1997-06-18 2001-11-15 Alcoa Gmbh Verpackwerke Behälterverschluss und Vorrichtung zu dessen Herstellung

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US3195754A (en) * 1963-03-18 1965-07-20 Continental Can Co Aluminum containing seal liners for beer containers and like substances
US3696956A (en) * 1968-05-16 1972-10-10 Grace W R & Co Container closure gasket made from a novel plastisol composition

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US3135019A (en) * 1961-06-22 1964-06-02 Ernest O Aichele Machine for applying sealing liners of thermoplastic material to bottle caps or the like
US3195754A (en) * 1963-03-18 1965-07-20 Continental Can Co Aluminum containing seal liners for beer containers and like substances
US3696956A (en) * 1968-05-16 1972-10-10 Grace W R & Co Container closure gasket made from a novel plastisol composition

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4717034A (en) * 1982-07-06 1988-01-05 Owens-Illinois Closure Inc. One-piece thermoplastic closure having press-on screw off structure including spaced vertical ribs in the skirt of the closure
US4971213A (en) * 1987-04-21 1990-11-20 Japan Crown Cork Co., Ltd. Plastic cap
US5685443A (en) * 1995-03-06 1997-11-11 White Cap, Inc. Composite closure and method of making same
US5692628A (en) * 1996-01-11 1997-12-02 Rexam Closure, Inc. Press-on screw-off self-tapping closure/container package
US6672469B2 (en) * 2000-07-07 2004-01-06 Peter Querbach Beverage bottle and method for closing a beverage bottle
US8495854B2 (en) * 2001-09-04 2013-07-30 Obrist Closures Switzerland Gmbh Crown-like twist-off closure
US20030041568A1 (en) * 2001-09-04 2003-03-06 Seidita Thomas M. Crown-like twist-off closure
US20050167392A1 (en) * 2004-01-29 2005-08-04 Fabricas Monterrey, S.A. De C.V. Metallic cap closure having water repelling properties and method of fabricating the same
US20060194892A1 (en) * 2005-02-28 2006-08-31 Sealed Air Corporation (Us) Blended foam having improved flexibility at sub-freezing temperatures
US20090084753A1 (en) * 2007-09-28 2009-04-02 Victor Ramos Process For Tooling For Manufacture Of A Composite Part Composite Stopper Obtained By Such A Process Or Such Tooling
US9630351B2 (en) * 2007-09-28 2017-04-25 Albea Services Process for tooling for manufacture of a composite part composite stopper obtained by such a process or such tooling
US20090223967A1 (en) * 2008-03-07 2009-09-10 Silgan Plastics Corporation Container with overcap
US7918360B2 (en) 2008-03-07 2011-04-05 Silgan Plastics Corporation Container with overcap
WO2016044460A1 (en) * 2014-09-16 2016-03-24 Dayton Systems Group, Inc. Cap assembly having inside seal
US9676524B2 (en) 2014-09-16 2017-06-13 Dayton Systems Group, Inc. Cap assembly having inside seal
CN107148386A (zh) * 2014-09-16 2017-09-08 Dsg技术有限责任公司 具有内密封的盖套件
US9821931B2 (en) 2014-09-16 2017-11-21 Dsg Technology Llc Cap assembly having inside seal
EP3194284A4 (en) * 2014-09-16 2018-04-18 Dayton Systems Group, Inc. Cap assembly having inside seal
US10214323B2 (en) 2014-09-16 2019-02-26 Dsg Technology Llc Cap assembly having inside seal
AU2015317738B2 (en) * 2014-09-16 2020-05-21 Dsg Technology Llc Cap assembly having inside seal
CN107148386B (zh) * 2014-09-16 2020-11-24 Dsg技术有限责任公司 具有内密封的盖套件
US11174080B2 (en) * 2018-03-28 2021-11-16 Can-Pack Metal Closures Spolka Z Ograniczona Odpowiedzialnoscia Easily openable pull-off beverage bottle closure
US20230019020A1 (en) * 2020-03-23 2023-01-19 Nippon Closures Co., Ltd. Metal cap and method for manufacturing same
US12006100B2 (en) * 2020-03-23 2024-06-11 Nippon Closures Co., Ltd. Metal cap and method for manufacturing same

Also Published As

Publication number Publication date
NZ191021A (en) 1983-07-15
DE2929752A1 (de) 1980-01-31
NO153960B (no) 1986-03-17
BE877796A (fr) 1979-11-16
IL57843A0 (en) 1979-11-30
CA1134322A (en) 1982-10-26
ES482693A1 (es) 1980-09-01
CH634522A5 (fr) 1983-02-15
IT7924535A0 (it) 1979-07-20
AU4910579A (en) 1980-01-31
ES250344U (es) 1980-07-16
ES250344Y (es) 1981-03-16
FI792280A7 (fi) 1980-01-23
GB2028781B (en) 1982-09-15
GB2028781A (en) 1980-03-12
FR2431438B1 (enrdf_load_stackoverflow) 1985-04-05
BR7904654A (pt) 1980-04-22
DE2929752C2 (enrdf_load_stackoverflow) 1993-01-21
IT1122244B (it) 1986-04-23
SE440215B (sv) 1985-07-22
MX152095A (es) 1985-05-29
NO792410L (no) 1980-01-23
FI71519B (fi) 1986-10-10
JPS5520126A (en) 1980-02-13
FR2431438A1 (fr) 1980-02-15
AR219402A1 (es) 1980-08-15
FI71519C (fi) 1987-01-19
JPS6159990B2 (enrdf_load_stackoverflow) 1986-12-18
SE7906187L (sv) 1980-01-23
ZA793733B (en) 1980-07-30
AU523059B2 (en) 1982-07-08
LU81530A1 (fr) 1979-10-31
IE791341L (en) 1980-01-22
NL7905672A (nl) 1980-01-24
IL57843A (en) 1981-03-31
NO153960C (no) 1986-06-25
IE48449B1 (en) 1985-01-23

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